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This is the first before and after tune dynograph we have seen for the M278 4.7 liter twin turbo direct injected V8. The results are impressive, as expected. The car tuned is a 2012 W218 Mercedes CLS550 completely stock on 91 octane. Baseline was a respectable 342 wheel horsepower. After the custom dyno tune, 389.9 whp. Torque went from 382.8 to 444.4. Looks like the M278 is going to be a formidable platform and have some people second guessing whether a 63 AMG model with the M157 is worth the extra cash.